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                <h1 id="什么是微信小程序"><a href="#什么是微信小程序" class="headerlink" title="什么是微信小程序?"></a>什么是微信小程序?</h1><p>今年1月9日，张小龙在2017微信公开课Pro上发布的小程序正式上线。<br><img src="http://wx1.sinaimg.cn/mw690/c2da5891gy1fo8zj8i2krj20a80b8wjc.jpg" alt=""></p>
<p>这段时间用小程序开发了一个豆瓣电影的小项目，感觉很简单，和vue的语法非常类似。</p>
<h1 id="开发准备"><a href="#开发准备" class="headerlink" title="开发准备"></a>开发准备</h1><p>官网：<a target="_blank" rel="noopener" href="https://mp.weixin.qq.com/debug/wxadoc/dev/api/">https://mp.weixin.qq.com/debug/wxadoc/dev/api/</a></p>
<p>微信提供了自己的标签语言和样式语言，基本语法和html，css基本相同。<br>开发环境直接使用官网提供的工具就行了，和开发公众号是一个工具。<br>[下载地址]<a target="_blank" rel="noopener" href="https://mp.weixin.qq.com/debug/wxadoc/dev/devtools/download.html">https://mp.weixin.qq.com/debug/wxadoc/dev/devtools/download.html</a>)</p>
<h1 id="基本文件结构"><a href="#基本文件结构" class="headerlink" title="基本文件结构"></a>基本文件结构</h1><p><img src="http://wx3.sinaimg.cn/mw690/c2da5891gy1fo8zxgs4qjj20fm08lmxz.jpg" alt=""></p>
<p>小程序启动的时候，会去读取这三个app开头的文件并生成一个小程序实例。app.js是整个小程序应用的全局逻辑，app.json是小程序的全局配置信息，app.wxss文件是小程序的全局样式，如果页面自己没有设置样式，就会使用全局样式。</p>
<p>pages是一个目录，所有与页面相关的文件都放到这个目录中。<br>鼠标右键即可新建一个页面，开发者工具会自动为每个页面生成4个文件，可见小程序把组件化开发体现<br>其中：<br><code>*.wxml</code><br>是微信提供的标签语言文件，语法和html类似，不过用法有点差别。<br><code>*.wxss</code><br>是微信提供的样式语言文件，语法和css类似，在css基础上作了部分删减和增强。<br><code>*.js</code><br>微信小程序依然使用的是javascript语言编程。<br><code>*.json</code><br>这个文件是页面的配置文件，里面可以进行一些参数的配置。</p>
<h1 id="框架结构"><a href="#框架结构" class="headerlink" title="框架结构"></a>框架结构</h1><p><img src="http://wx3.sinaimg.cn/mw690/c2da5891gy1fo90cy3fyoj20n50diq5a.jpg" alt=""></p>
<p>从上图可以看到，小程序分成三个层次，</p>
<ul>
<li>视图层</li>
<li>逻辑层</li>
<li>系统层</li>
</ul>
<p>视图层响应逻辑层逻辑和数据的变化，视图层将用户的操作反馈到逻辑层。但是还需要微信的系统层作为中间层来管理视图层和逻辑层的交互。这样可以避视图图层和逻辑层之间的直接依赖。</p>
<p>我们开发小程序，就只需要在视图层和逻辑层编写代码，其他的功能由底层实现。</p>
<h1 id="配置信息"><a href="#配置信息" class="headerlink" title="配置信息"></a>配置信息</h1><h2 id="全局配置"><a href="#全局配置" class="headerlink" title="全局配置"></a>全局配置</h2><p>全局配置在app.json中进行，可以配置与窗口相关，页面等相关的信息。<br><img src="http://wx4.sinaimg.cn/mw690/c2da5891gy1fo90hmad9jj20d10f0wh4.jpg" alt=""></p>
<p>电影demo的全局配置文件：</p>
<pre class="line-numbers language-json" data-language="json"><code class="language-json"><span class="token punctuation">&#123;</span>
    <span class="token property">"pages"</span><span class="token operator">:</span> <span class="token punctuation">[</span>

        <span class="token string">"pages/hotplaying/hotplaying"</span><span class="token punctuation">,</span>
        <span class="token string">"pages/comesoon/comesoon"</span><span class="token punctuation">,</span>
        <span class="token string">"pages/detail/detail"</span>
    <span class="token punctuation">]</span><span class="token punctuation">,</span>
    <span class="token property">"window"</span><span class="token operator">:</span> <span class="token punctuation">&#123;</span>
        <span class="token property">"backgroundTextStyle"</span><span class="token operator">:</span> <span class="token string">"light"</span><span class="token punctuation">,</span>
        <span class="token property">"navigationBarBackgroundColor"</span><span class="token operator">:</span> <span class="token string">"#00f"</span><span class="token punctuation">,</span>
        <span class="token property">"navigationBarTitleText"</span><span class="token operator">:</span> <span class="token string">"WeChat"</span><span class="token punctuation">,</span>
        <span class="token property">"navigationBarTextStyle"</span><span class="token operator">:</span> <span class="token string">"black"</span>
    <span class="token punctuation">&#125;</span><span class="token punctuation">,</span>
    <span class="token property">"tabBar"</span><span class="token operator">:</span> <span class="token punctuation">&#123;</span>

        <span class="token property">"list"</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token punctuation">&#123;</span>
            <span class="token property">"pagePath"</span><span class="token operator">:</span> <span class="token string">"pages/hotplaying/hotplaying"</span><span class="token punctuation">,</span>
            <span class="token property">"text"</span><span class="token operator">:</span> <span class="token string">"正在热映"</span><span class="token punctuation">,</span>
            <span class="token property">"iconPath"</span><span class="token operator">:</span> <span class="token string">"image/ing.png"</span><span class="token punctuation">,</span>
            <span class="token property">"selectedIconPath"</span><span class="token operator">:</span> <span class="token string">"image/ing-active.png"</span>
        <span class="token punctuation">&#125;</span><span class="token punctuation">,</span> <span class="token punctuation">&#123;</span>
            <span class="token property">"pagePath"</span><span class="token operator">:</span> <span class="token string">"pages/comesoon/comesoon"</span><span class="token punctuation">,</span>
            <span class="token property">"text"</span><span class="token operator">:</span> <span class="token string">"即将上映"</span><span class="token punctuation">,</span>
            <span class="token property">"iconPath"</span><span class="token operator">:</span> <span class="token string">"image/coming.png"</span><span class="token punctuation">,</span>
            <span class="token property">"selectedIconPath"</span><span class="token operator">:</span> <span class="token string">"image/coming-active.png"</span>
        <span class="token punctuation">&#125;</span><span class="token punctuation">]</span>
    <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h2 id="局部配置"><a href="#局部配置" class="headerlink" title="局部配置"></a>局部配置</h2><p>某个页面如果需要设置单独的窗口样式，可以在本页面的*json文件中配置。并且如果页面的配置中和app.json文件中的全局配置有冲突的属性，app.json的配置会被覆盖。页面的配置中只能进行窗口样式的配置，因此不写window这个键。</p>
<pre class="line-numbers language-json" data-language="json"><code class="language-json"><span class="token punctuation">&#123;</span>
  <span class="token property">"navigationBarBackgroundColor"</span><span class="token operator">:</span> <span class="token string">"#ffffff"</span><span class="token punctuation">,</span>
  <span class="token property">"navigationBarTextStyle"</span><span class="token operator">:</span> <span class="token string">"black"</span><span class="token punctuation">,</span>
  <span class="token property">"navigationBarTitleText"</span><span class="token operator">:</span> <span class="token string">"主页"</span><span class="token punctuation">,</span>
  <span class="token property">"backgroundColor"</span><span class="token operator">:</span> <span class="token string">"#eeeeee"</span><span class="token punctuation">,</span>
<span class="token punctuation">&#125;</span>
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h1 id="逻辑层"><a href="#逻辑层" class="headerlink" title="逻辑层"></a>逻辑层</h1><p>微信小程序的逻辑层代码是由JavaScript编写的，只不过微信小程序在JavaScript的基础上，作了一些扩展和修改：</p>
<ol>
<li>增加 App 和 Page 方法，进行程序和页面的注册。</li>
<li>提供丰富的 API，如扫一扫，支付等微信特有能力。</li>
<li>不能进行DOM节点操作。</li>
</ol>
<h2 id="注册全局app"><a href="#注册全局app" class="headerlink" title="注册全局app"></a>注册全局app</h2><p>App()函数用来注册一个小程序。接受一个object参数，其指定小程序的生命周期函数：</p>
<pre class="line-numbers language-js" data-language="js"><code class="language-js"><span class="token comment">//app.js</span>
<span class="token function">App</span><span class="token punctuation">(</span><span class="token punctuation">&#123;</span>
  <span class="token function-variable function">onLaunch</span><span class="token operator">:</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token comment">//app初始化完成</span>
  <span class="token punctuation">&#125;</span><span class="token punctuation">,</span>
  <span class="token function-variable function">onShow</span><span class="token operator">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token comment">//app显示</span>
  <span class="token punctuation">&#125;</span><span class="token punctuation">,</span>
  <span class="token function-variable function">onHide</span><span class="token operator">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token comment">//app隐藏</span>
  <span class="token punctuation">&#125;</span><span class="token punctuation">,</span>
  <span class="token function-variable function">sayHello</span><span class="token operator">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token comment">//自定义函数</span>
  <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span class="token punctuation">)</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>App()函数必须在app.js中执行，且只能执行一次，代表注册这个小程序，并生成一个app对象。要在这个函数中使用这个对象，直接用this即可。要在页面中使用这个对象，可以使用全局函数getApp()来获取app实例。</p>
<h2 id="注册页面"><a href="#注册页面" class="headerlink" title="注册页面"></a>注册页面</h2><p>Page()函数用来注册一个页面。接受一个object参数，指定页面的初始数据、生命周期函数、事件处理函数等。</p>
<pre class="line-numbers language-js" data-language="js"><code class="language-js"><span class="token comment">// pages/test/test.js</span>
<span class="token function">Page</span><span class="token punctuation">(</span><span class="token punctuation">&#123;</span>
  <span class="token comment">/**
   * 页面的初始数据
   */</span>
  data<span class="token operator">:</span> <span class="token punctuation">&#123;</span>
  
  <span class="token punctuation">&#125;</span><span class="token punctuation">,</span>
  <span class="token comment">/**
   * 生命周期函数--监听页面加载
   */</span>
  <span class="token function-variable function">onLoad</span><span class="token operator">:</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">options</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
  
  <span class="token punctuation">&#125;</span><span class="token punctuation">,</span>

  <span class="token comment">/**
   * 生命周期函数--监听页面初次渲染完成
   */</span>
  <span class="token function-variable function">onReady</span><span class="token operator">:</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
  
  <span class="token punctuation">&#125;</span><span class="token punctuation">,</span>

  <span class="token comment">/**
   * 生命周期函数--监听页面显示
   */</span>
  <span class="token function-variable function">onShow</span><span class="token operator">:</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
  
  <span class="token punctuation">&#125;</span><span class="token punctuation">,</span>

  <span class="token comment">/**
   * 生命周期函数--监听页面隐藏
   */</span>
  <span class="token function-variable function">onHide</span><span class="token operator">:</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
  
  <span class="token punctuation">&#125;</span><span class="token punctuation">,</span>

  <span class="token comment">/**
   * 生命周期函数--监听页面卸载
   */</span>
  <span class="token function-variable function">onUnload</span><span class="token operator">:</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
  
  <span class="token punctuation">&#125;</span><span class="token punctuation">,</span>

  <span class="token comment">/**
   * 页面相关事件处理函数--监听用户下拉动作
   */</span>
  <span class="token function-variable function">onPullDownRefresh</span><span class="token operator">:</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
  
  <span class="token punctuation">&#125;</span><span class="token punctuation">,</span>

  <span class="token comment">/**
   * 页面上拉触底事件的处理函数
   */</span>
  <span class="token function-variable function">onReachBottom</span><span class="token operator">:</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
  
  <span class="token punctuation">&#125;</span><span class="token punctuation">,</span>

  <span class="token comment">/**
   * 用户点击右上角分享
   */</span>
  <span class="token function-variable function">onShareAppMessage</span><span class="token operator">:</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
  
  <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span class="token punctuation">)</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>除了生命周期函数，开发者可以定义自己的函数，但是不需要写在method属性中。</p>
<h2 id="代码模块化"><a href="#代码模块化" class="headerlink" title="代码模块化"></a>代码模块化</h2><p>我们可以将一些公共的代码抽离成为一个单独的js文件，作为一个模块。就像utils文件夹中的工具代码一样。可以过module.exports模块将工具函数暴露出去。<br><img src="http://wx2.sinaimg.cn/mw690/c2da5891gy1fo90yr55cqj207303amxd.jpg" alt=""></p>
<p>需要使用的页面，使用require(path)将公共代码引入。<br><img src="http://wx2.sinaimg.cn/mw690/c2da5891gy1fo90zkfn2mj206303emxc.jpg" alt=""></p>
<h1 id="视图层"><a href="#视图层" class="headerlink" title="视图层"></a>视图层</h1><p>微信小程序的视图层由wxml和wxss共同完成。</p>
<ul>
<li>wxml用于描述页面的结构，</li>
<li>wxss用于描述页面的样式。</li>
</ul>
<h2 id="wxml"><a href="#wxml" class="headerlink" title="wxml"></a>wxml</h2><p>WXML与HTML类似，用来构建页面的基本结构。常用的标签有<code>&lt;view&gt;</code>，<code>&lt;text&gt;</code>等。<br>WXSS与CSS类似，是用来给页面的标签设置样式的。大多数CSS的规则在WXSS中都可以直接使用。但是WXSS在CSS的语法基础上进行了修改和扩展。比如去掉了CSS中的动画，并新增了rpx这个单位。认为任何一个手机屏幕宽度都是750rpx。支持class,id,element选择器。</p>
<p>微信小程序不能操作节点,微信提供了一些语法来帮助开发者连接视图和逻辑层，可以将逻辑层中的数据显示到WXML中去。</p>
<h1 id="数据绑定"><a href="#数据绑定" class="headerlink" title="数据绑定"></a>数据绑定</h1><p>如果WXML布局中的数据需要动态设置，那么一定是来自于对应的.js文件的data属性。在布局页面中使用时，只要是逻辑层的数据都要用双括号包起来。</p>
<p><img src="http://wx4.sinaimg.cn/mw690/c2da5891gy1fo912ha4rej20i4090wf9.jpg" alt=""></p>
<p>如果想要在逻辑层动态地对视图层的数据进行修改。可以在.js文件中调用page对象的setData()方法。</p>
<pre class="line-numbers language-js" data-language="js"><code class="language-js"><span class="token function-variable function">onLoad</span><span class="token operator">:</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
    console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'onLoad'</span><span class="token punctuation">)</span>
<span class="token comment">//更新数据</span>
      <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">setData</span><span class="token punctuation">(</span><span class="token punctuation">&#123;</span>
        name<span class="token operator">:</span><span class="token string">'李四'</span>
      <span class="token punctuation">&#125;</span><span class="token punctuation">)</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>微信小程序中，我们可以在布局文件中加一些条件来决定该标签是否被渲染，并显示在页面上。</p>
<h1 id="条件渲染"><a href="#条件渲染" class="headerlink" title="条件渲染"></a>条件渲染</h1><pre class="line-numbers language-html" data-language="html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>view</span> <span class="token attr-name"><span class="token namespace">wx:</span>if</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>&#123; &#123;condition&#125; &#125;<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> True <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>view</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>view</span> <span class="token attr-name"><span class="token namespace">wx:</span>elif</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>&#123; &#123;condition&#125; &#125;<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> True <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>view</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>view</span> <span class="token attr-name"><span class="token namespace">wx:</span>else</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>&#123; &#123;condition&#125; &#125;<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> True <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>view</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre>
<p>如果我们想一次判断多个标签，可以使用block标签将多个标签包裹起来。并将判断条件写在<block>中。</p>
<pre class="line-numbers language-html" data-language="html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>block</span> <span class="token attr-name"><span class="token namespace">wx:</span>if</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>&#123; &#123;condition&#125; &#125;<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> 
	<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>view</span><span class="token punctuation">></span></span> 1 <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>view</span><span class="token punctuation">></span></span>
	<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>view</span><span class="token punctuation">></span></span> 2 <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>view</span><span class="token punctuation">></span></span>
	<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>view</span><span class="token punctuation">></span></span> 3 <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>view</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>block</span> <span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>以上代码表示如果满足条件condition，就渲染block标签内部的三个view</p>
<p>如果一个标签有hidden属性，且值为true，那么会被隐藏。这个隐藏和条件渲染中的不渲染是有区别的。<br>区别在于：hidden隐藏的标签，不管是否隐藏，都会被渲染。而条件渲染中不满足条件，就不会被渲染。</p>
<h1 id="列表渲染"><a href="#列表渲染" class="headerlink" title="列表渲染"></a>列表渲染</h1><p>如果需要在页面中显示一个列表，我们可以使用wx:for绑定一个数组，即可以使用数组中的数据来重复渲染某个组件。<br><img src="http://wx4.sinaimg.cn/mw690/c2da5891gy1fo917qogkfj20p408t0ub.jpg" alt=""></p>
<p>列表重复渲染某种标签的时候，index是默认的当前渲染项的下标变量名，item是数组中的项默认名称。<br>如果不想使用默认的，可以使用：</p>
<ul>
<li>wx:for-index来自定义下标变量名，</li>
<li>wx:for-item来自定义数组中当前元素的变量名。<pre class="line-numbers language-html" data-language="html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>view</span> <span class="token attr-name"><span class="token namespace">wx:</span>for</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>&#123; &#123;array&#125; &#125;<span class="token punctuation">"</span></span> <span class="token attr-name"><span class="token namespace">wx:</span>for-index</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>idx<span class="token punctuation">"</span></span> <span class="token attr-name"><span class="token namespace">wx:</span>for-item</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>itemName<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
  &#123;&#123;idx&#125;&#125;: &#123;&#123;itemName.message&#125;&#125;
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>view</span><span class="token punctuation">></span></span>
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre>
如果一个列表项有多个组件，也可以用<block>标签包裹起来。<pre class="line-numbers language-html" data-language="html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>block</span> <span class="token attr-name"><span class="token namespace">wx:</span>for</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>&#123; &#123;arry&#125; &#125;<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
  	<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>view</span><span class="token punctuation">></span></span> &#123;&#123;index&#125;&#125;: <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>view</span><span class="token punctuation">></span></span>
  	<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>view</span><span class="token punctuation">></span></span> &#123;&#123;item&#125;&#125; <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>view</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>block</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>
<h1 id="事件"><a href="#事件" class="headerlink" title="事件"></a>事件</h1>事件可以将用户的行为从视图层反馈到逻辑层。wxml布局中的组件可以绑定事件，当事件发生之后，就会触发逻辑层中对应的事件处理函数。<h2 id="事件分类"><a href="#事件分类" class="headerlink" title="事件分类"></a>事件分类</h2>事件分为冒泡事件和非冒泡事件，冒泡事件会在触发后向父节点传递。常用的事件类型如下：<br><code>touchstart</code><br>手指触摸时会触发<br><code>touchmove</code><br>手指触摸后移动会触发<br><code>touchend</code><br>手指触摸动作结束<br><code>tap</code><br>手指触摸后离开屏幕<br><code>longtap</code><br>长时间触摸（350ms）</li>
</ul>
<h2 id="事件绑定"><a href="#事件绑定" class="headerlink" title="事件绑定"></a>事件绑定</h2><p>通过bind或者catch+事件类型来为组件绑定事件。用bind绑定的事件会继续冒泡，而用catch绑定的事件会停止冒泡。</p>
<pre class="line-numbers language-html" data-language="html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>view</span>  <span class="token attr-name">bindtap</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>mTap<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>view</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>
<p>以上代码表示，为view组件绑定一个触摸后离开（点击）的事件，当事件发生后，会调用对应的.js代码中的名为 mTap的函数。</p>
<h2 id="事件对象"><a href="#事件对象" class="headerlink" title="事件对象"></a>事件对象</h2><p>当事件触发后，该事件的处理函数会收到一个事件对象。我们可以从该对象中查看如下信息。<br><code>type</code><br>事件的类型</p>
<p><code>timestamp</code><br>事件生成时的时间戳</p>
<p><code>target</code><br>触发事件的组件的一些属性值集合</p>
<p><code>currentTarget</code><br>当前组件的一些属性值集合</p>
<p><code>detail</code><br>额外的信息</p>
<h2 id="通过事件传递额外信息"><a href="#通过事件传递额外信息" class="headerlink" title="通过事件传递额外信息"></a>通过事件传递额外信息</h2><p>我们可以通过事件对象来传递一些额外的信息。这些信息是在标签中通过data-*的形式存放的。<br>在事件对象中取出额外信息的方式：</p>
<pre class="line-numbers language-js" data-language="js"><code class="language-js">event<span class="token punctuation">.</span>target<span class="token punctuation">.</span>dataset<span class="token punctuation">.</span><span class="token operator">*</span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>


                
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